I think of Silver Surfer as not being written to the level of what his power set is supposed to be. He already has the strength to lift 100 tons but written to move at speeds much much faster then the Flash. Fast enough to easily travel thru time like the Flash has done. Now the Flash, if he's just standing in place has the strength of a normal person, but if he hits someone while he's moving, the kinetic force is so powerful that's his blows have been said to be among any of the heavy hitters in comics. Wonder Woman once said the Hunter Solomon (Zoom) punched harder then Superman did. Well, if you take Silver Surfer with his normal strength of lifting 100 tons, and he hits someone at 10 times the speed of light, then the shock wave should be able to destroy a moon.
Other Characters who I think are under rated are B level characters. Forge, Cypher, and Multiple Man. Multiple can study anything and everything with one of his duplicates, and it will remembered by the prime. Think of studying everything and knowing everything? Forge on the other hand can create anything he thinks of that's mechanical, but he can make mechanical items that make things that are NOT mechanical. Why not something that can give him any power he wants. His brain works on the level of understanding anything so he can't make something to powerful for him either.
Cypher, the language powered mutant, I never looked at the same after I read the Necrosha story where Selene brought him back from the dead. He almost beat the New Mutants single handed because read their body language so he was able to counter their fighting techniques. He read their body language, which was pretty slick by what ever writer was writing him at the time. When the brain uses a language to command the body to do something. I always thought if Cyber could see any character use their power, the language from the brain to the body, he would be able to replicate that.
Speedball, was another character I thought was more powerful then he's been written.